Synthesis of 2-Oxo-2,5-dihydropyrroles; A Structural Reassignment

A One-Pot Synthesis of Functionalised 3-pyrolin-2-ones by a four-component reaction between Triphenylphosphine, Primary Amines, Dimethyl Acetylenedicarboxylate and Ethyl Chlorooxoacetate

Reaction between triphenylphosphine, dimethy acetylenedicarboxylate and amines produces phosphorus ylids which undergo a smooth reaction with ethyl chlorooxoacetate and triethylamine to produce dimethyl N-aryl-(or alkyl)-4-ethoxy-5-oxo-2,5-dihydro-1 H-pyrole-2,3-dicarboxylates in high yields.

Synthesis of Highly Substituted 3-Pyrrolin-2-ones from N,N-Disubstituted α-Amino Acids

Highly functionalized 5-membered N-heterocyclic compounds, 4-aryl-3-chloro-5-methoxy-1-methyl-3-pyrrolin-2-ones, have been synthesized in moderate to high yields by the reaction of N,N-dimethylated aromatic α-amino acids with oxalyl chloride, followed by solvolysis with MeOH. The products possess a number of functional groups such as an amide, a mixed amido/alkoxy acetal, a vinyl halide, and an alkene and thus are promising candidates to be used as starting materials for the synthesis of diverse five-membered N-heterocyclic compounds.

Three-component Reaction between Ethyl N-(4-oxo-2-thioxothiazolidin-3-yl) Oxalamate and Acetylenic Esters in the Presence of Triphenylphosphine

N-aminorhodanine reacts with ethyl chlorooxoacetate in ethanol to produce ethyl N-(4-oxo-2-thioxothiazolidin-3-yl)oxalamate in nearly quantitative yield. Reaction between this adduct and electron-deficient acetylenic esters in the presence of triphenylphosphine leads to dialkyl 4-ethoxy-5-oxo-1-(4-oxo-2-thioxothiazolidin-3-yl)-2,5-dihydro-1 H-pyrrole-2,3-dicarboxylate derivatives in good yields.